Scaffold ladder



Feb. 20, 1940. R. A. UE CKER EITAL SCAFFOLD LADDER Filed Se t. 19, 1938r 0 9 w 1 t v.5? m m 3 40%. m a? Wm? 2 fi/w $7 Feb. 20,1940. R. UECKERETAL 5 SCAFFOLD LADDER Filed Sept. 19; 1938 4 2 Sheets -Sheet 2 jig 7"Q7/4 30 .{rar-eg Patented Feb. 20, 1940 UNITED STATES PATENT, orrlceReinhold A. Uecker, Ingar G. Rambo, and David E. Beatty, Wauwatosa, Wis.

Application September 19,1938, Serial No. 230,648

' 11 Claims. (01. 2213-45),

This invention relates to scaffolds and more.

particularly to a ladder for use on scaffolds.

One object of the present invention is to produce a ladder for use onscaffolds which will be I moreeconomical to manufacture than those nowon the market.

Another object is to produce'a sectional ladder for use on scaffolds inwhich the danger from failure is reduced through suitablyinterconnecting the sections.

Fig. 2, looking in the direction of the arrows;

and 1 Fig. 4 is a perspective view of the ladder.

5 Referring to the drawings in which like numerals indicate like partsthroughout the several ,views, the scaffold is shown as composed of aplurality of end frames l superimposed on each other with the superposedframes being joined I by coupling pins II. The frames! are connected toother frames in the same level by cross braces i2, which are joined tothe end I frames by bolts and wing nuts (not shown).

Each end frame is composed of two parallel 8 vertical posts l3, one ofwhich is shown, which are held in spaced parallel relationship byhorizontal braces l4--l4.

All the above structure is, in itself, old, and

is more fully described in the United States 0 patent to Reinhold A.Uecker, No. 2,043,498, issued 1 is engageable around the post I3 and hasahook portion 2| engageable over the horizontal brace I l. A rung 23 isattached to the bracket so as to extend at right angles to the plane ofthe end frames l0.

Side bars 25 are fixed on the opposite ends of the rung 23 so as to beparallel to each other in and to the post IS. The side bars arepreferably brackets more securely on the rungs, braces 34 made tubularand are provided with pins 26 at the upper ends which are engaged by thelower ends of the tubular side bars of the superposed ladder to insurethe side bars remaining in true alinement and to provide an'extra safetyfactor inthe event of a failure of the bracket 20. The side bars 25support a plurality of rungs 21, 28, 29 parallel to the rung 23, therungs 21, 28, 29 being fixed, preferably by welding, between the sidebars 25.

A second'bracket 30 is carried by the rung 28, and is engageable aroundthe post l3. An inverted U-shaped yoke 3| is formed on the inner end of.the bracket. 30 and extends at right angles to the body of the bracket,or parallel to In the rungs 23 and 28. A second yoke 32, parallel to andin alinement with the yoke 3| is formed' on the opposite side of thebracket from the yoke 3|. A latch 33 is pivotally mounted in the yoke3|. and .engages in the yoke 32. and actsboth as 'a latch and as asupplemental support for the ladder in the event of a failure of thebracket 20.

In order to strengthen the-ladder and to fix the a and are provided forthe brackets 20 and 30 respectively. The braces 34 and 35 are closelyadjacent the rungs 23 and 28 respectively, and are secured to both thebrackets 20 and 30 and m w to both side bars 25.

said brace, a rung attached to said supporting bracket, a side barconnected to each end of said rung, a brace joining the lowerportion ofsaid bracket with the side-bars, and a plurality of rungs carried bysaid side bars. v 2. A sectional ladder for use with a sectionalscaffold or the like havinga vertical post and a horizontal braceconnected thereto, saidladder comprising, a bracket engagea-ble aroundsaid post and supported on said brace, a rung attached to saidsupporting bracket, a side bar connected 'to each end of said rung, aplurality of was carried by said side bars, and means on said side barsengageable with the side bars of I an adjacent ladder section to lockthe side bars 1 in alinement with the side bars of said last namedsection. I

3. A sectional ladder for use with a sectional scafiold having avertical post and a horizontal brace, said ladder comprising, a bracketengageable over said brace, a rung fixed to said bracket, a tubular sidebar fixed to each end of said rung, a, plurality of rungs carried by.the side bars, and a connecting pin fixed in one end of said side barsengageable with the tubular side bars of. an adjacent ladder section tomaintain the sections against accidental disengagement. 4. A ladder foruse with a scafiold'having a vertical post and a horizontal brace, saidladder comprising a bracket engageable around saidplurality of rungscarried by the side bars, and

side bars attached to and carried by said rung.

5. A ladder for use with a scaffold or the like having a vertical postand a horizontal brace,

. said ladder comprising, an attaching bracket enby said sidebars, asecond bracket connected with one of said rungs and engageable with saidpost, and a latch carried by said second bracket.

6. A sectional ladder for use with asectional scaffold or the likehaving a vertical post and a horizontal brace connected thereto, saidladder comprising, a bracket engageable around said post and supportedon said brace, a rung attached to said supporting bracket,'a side barconnected to each end of said rung, a plurality of rungs carried by saidside bars, means on said side bars engageable with the side bars of anadjacent ladder section to lock the side bars in alinement with thesidebars of said last named section, a second bracket connected with oneof said rungs and engageable with said post, and a latch carried by saidsecond bracket.

7. A sectional ladder for use with a sectional scaffold having averticalpost and a horizontal 1 brace, said ladder comprising, a bracketengageable over saidbrace, a rung fixed to said bracket, a tubular sidebar fixed to each end of said rung, a plurality of rungs fixed betweensaid sidebars, a connecting pin fixed in one end of said side barsengageable with the tubular side bars of an adjacent ladder section tomaintain the sections against accidental disengagement, a second bracketconnected with one of said rungs and engageable with said post, and alatch carried by said second bracket.

8. A sectional ladder for use with a sectional scaffold or the likehaving a vertical post and a horizontal brace connected thereto, saidladder comprising; a bracket engageable around said post and supportedon said brace, a rung attached to said supporting bracket, a side barconnected to each end of said rung, a brace connected to said bracketadjacent the lower end thereof and joining said bracket with said sidebars, a plurality of rungs carried by said side bars, and means on saidside bars engageable with the side bars of an adjacent ladder section tolock the side bars in alinement with the side bars of an adjacentsection.

9. A sectional ladder for use with a sectional scaffold having avertical post and a horizontal brace connected therewith, said laddercomprising, a bracket engageable over said brace, a rung fixed to saidbracket, a tubular side bar fixed to each end of said rung, a bracemember joining the lower portion of said bracket with said tubular sidebars, a plurality of" rungs carried by said side bars, and a connectingpin fixed in each of said sidebars engageable with the tubular side barsof an adjacent section to maintain the sections against accidentaldisengagement.

10. A sectionalladder for use with a sectional scaffold or the likehaving a vertical post and a horizontal brace connected thereto, saidladder comprising, a bracket engageable around said post and supportedon said brace, a rung attached to said supporting bracket, a side barconnected to each end of said rung, a supporting brace connecting thelower end of said bracket with said side bars, a plurality of rungscarried by said side bars,'means on said side bars engageable with theside bars of an adjacent ladder section to lock the side bars inalinement with the side bars of said last named section, a secondbracket connected with one of said rungs and engageable with said post,and a latch carried by said second bracket.

11. A sectional ladder for use with a sectional bars, a connecting pinfixed in one end of said side bars engageable with the tubular side barsof an adjacent ladder section to maintain the sections againstaccidental disengagement, a second bracket connected with one of saidrungs and engageable with said post, and a latch carried by said secondbracket.

REINHOLD A. UECKER. INGAR G. RAMBO. DAVID E. BEATTY.

